CyberHunter
Local dataset, no network
// Other services

Port 2409: SNS Protocol

Port 2409 is assigned by IANA to sns-protocol (SNS Protocol).

2409

How sns-protocol works

Other services
client:2409sns-protocolresponse client:2409sns-protocolresponse

The client sends a request to port 2409 and the sns-protocol service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2409 dangerous?

We have no specific security note for port 2409. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2409

ServicePortTransportDescriptionReferenceUpdated
sns-protocol 2409 TCP, UDP SNS Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2409, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2409'      # process listening on 2409
sudo lsof -nP -i :2409

macOS

sudo lsof -nP -i :2409

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2409 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2409
netstat -ano | findstr :2409

From another machine

nmap -p 2409 -sV <host>
sudo nmap -sU -p 2409 <host>
nc -zv <host> 2409

Block it in the firewall

sudo ufw deny 2409/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2409" -Direction Inbound -LocalPort 2409 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2409 used for?

Port 2409 is assigned by IANA to sns-protocol (SNS Protocol).

Is port 2409 TCP or UDP?

Port 2409 is registered for TCP and UDP.

Is it safe to open port 2409?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 2409 is open?

On Linux run "ss -ltnup 'sport = :2409'", on macOS "lsof -nP -i :2409", and on Windows "netstat -ano | findstr :2409" to see the local process. From another machine, "nmap -p 2409 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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